Ask Your Question
0

你们VU系列支持lpddr4吗?

asked 2018-11-15 20:32:25 -0600

nick qian gravatar image

updated 2020-01-13 03:10:35 -0600

fae gravatar image
edit retag flag offensive close merge delete

1 answer

Sort by » oldest newest most voted
0

answered 2018-11-25 20:14:05 -0600

nick qian gravatar image

updated 2018-11-25 20:57:18 -0600

1) ​VU440芯片原本不支持LPddR4;
但是可以用“HSUL I/O standard with VCCO set to 1.1V to interface with LPDDR4 at very low data rates (< 300MHz)”,​(原来的LPDDR4 IO标准是LVSTL<low voltage="" swing="" terminated="" logic="">)

2)因为LPDDR4的颗粒IO电压是1.1V的; 所以如果客户要验证lpddr4,需要修改VU SODIMM的电压(原来VU SODIMM的电压是ddr4的1.2v电压):

3)根据 Vout=(Rx/1K +1 )*0.5 修改Rx。(我们没有子板,我们客户的经验是在sodimm上做lpddr4的子板,有几个客户是这样做的)

这里是JEDEC的标准,这里是Micron颗粒的参考。

edit flag offensive delete link more

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Question Tools

1 follower

Stats

Asked: 2018-11-15 20:32:25 -0600

Seen: 270 times

Last updated: Jan 13 '20